Halloween, All Soul's Day and other traditions celebrated from the end of October to the end of November.

Halloween, also known as All Hallows' Eve is a celebration observed in many countries on 31 October, the eve of the Christian feast of All Hallows' Day. Halloween activities include trick-or-treating, attending costume parties, carving pumpkins, and telling scary stories... (PT1)

...Today's Halloween customs are thought to have been influenced by folk customs and beliefs from the Celtic countries. Some say that Halloween began solely as a Christian holiday, the vigil of All Hallow's Day...
(PT2)

... In many parts of the world, the Christian religious observances of All Hallows' Eve, including attending church services and lighting candles on the graves of the dead, remain popular, although elsewhere it is a more commercial fare. (PT3)

Día de Muertos is a Mexican holiday celebrated in Mexico and elsewhere associated with the Catholic celebrations of All Saints' & All Souls' Day. The multi-day holiday involves family & friends gathering to pray for and remember friends and family members who have died... (PT1)

...Day of the Dead is portrayed as a day of celebration rather than mourning. Traditions connected with the holiday include building altars called ofrendas, honoring the deceased using calaveras, marigolds, and the favorite foods, & visiting graves with those gifts... (PT2)

...A common symbol of the holiday is the skull (in Spanish calavera), which celebrants represent in masks, called calacas (colloquial term for skeleton), and foods such as sugar or chocolate skulls, which are inscribed with the name of the recipient on the forehead. (PT3)

All Saints’ Day in France marks a school and work break half-way between Summer and Christmas. For the French Catholics, “Toussaint” is a special time for honouring the dead. A time to visit cemeteries and put flowers on the graves. This happens on the 1st of November... (PT1)

...Members of a family usually gather to go to the cemetery together. Family members decorate the grave with potted: heather, (bruyère), chrysanthemum (chrysanthèmes) and/or immortal wreaths (couronnes d’immortelles – everlasting flowers) (PT2)

Read more: https://frenchmoments.eu/all-saints-day-in-france-la-toussaint/

Castañada, or Magosto, is a traditional festival in Portugal & some areas of Spain, such as Galicia, Cantabria, Asturias and the provinces of León, Zamora and Salamanca and Cáceres. It is additionally celebrated in parts of the Canary Islands.and across Catalonia... (PT1)

It is celebrated from the end of October through the month of November, and the main elements are chestnuts and fire. It has Celtic roots, and it is common to leave the fire set and food around the fireplace so that the deceased of the family can partake. (PT2)

...In Catalonia, celebrations involve eating castanyes (roasted chestnuts) and Ossos de Sant cake.

The "Magosto" is the Galician/Portuguese autumn festival similar to Samhain. In addition to chestnuts and local young wine, various foods have been incorporated... (PT2)...

...The tradition of eating these foods comes from the fact that during All Saints' night, on the eve of All Souls' Day in the Catholic tradition, bell ringers would ring bells in commemoration of the dead into the early morning. Everyone would eat these foods for sustenance (PT3)

Totensonntag (Sunday of the Dead), is a North German and Dutch Protestant religious holiday commemorating the dead. It falls on the last Sunday before the First of the Sundays of Advent (i.e. always on or between Nov. 20 and Nov. 26). In the US, some Protestant churches celebrate

In Italy, on 2nd November, Tutti i Morti, families remember loved ones who have died. These are still the main holidays. In some Italian tradition, children would awake on the morning of All Saints or All Souls to find small gifts from their deceased ancestors... (PT1)

....In Sardinia, Concas de Mortu (Head of the deads), carved pumpkins that look like skulls.

In Veneto these carved pumpkins were called lumère or suche dei morti (deads' pumpkins).

In many Italian places it is common to prepare some sweets, called dolci dei morti. (PT2)

Alla helgons dag in Sweden is a solemn day of remembrance when lighted candles are placed in cemeteries to remember friends and loved ones who have passed away. The custom of lighting candles to place on graves was brought to Sweden from Catholic countries to the south.

Romanian Orthodox believers celebrate on November 30 Saint Andrew (Sfantul Andrei), the saint considered the protector of Romania.

St. Andrew’s Day is one of the most important religious holidays in Romania, and is surrounded by superstitions and traditions.

From 31 Oct-2 Nov, many Filipinos travel back to their hometowns for family gatherings of festive remembrance.

In the Philippines, Hallow-mas is variously called "Undás", "Todos los Santos", and sometimes "Araw ng mga Patay, which incorporates All Saints' and All Souls' Day.

Dia das Bruxas is the name for "Halloween" in Brazil. It has started to grow in some parts of the country, as it has in other Latin American countries, such as northern Mexico and the Dominican Republic.

All Saints' Day is a Christian solemnity celebrated in honour of all the saints, known and unknown. Its intent is to celebrate all the saints, including those who do not, or no longer, are celebrated individually, it is common in Catholicism, it is celebrated on Nov 1st... (PT1)

...All Souls' Day, also known as the Commemoration of All the Faithful Departed and the Day of the Dead, is a day of prayer and remembrance for the souls of those who have died, which is observed by Catholics and other Christian denominations annually on November 2nd... (PT2)

...Allhallowtide is the Western Christian season encompassing All Saints' Eve (Halloween), All Saints' Day (All Hallows') & All Souls' Day. The present date of All Saints' Day and thus also of its vigil (Hallowe'en) was established perhaps by Pope Gregory III (731–741)... (PT3)

..The Catholic Church teaches that the purification of the souls in purgatory can be assisted by the actions of the faithful on earth. For this reason, many visit the graves of their ancestors in order to pray & celebrate their lives on earth, as well as clean their graves. (PT4)